HELIX. 95 



more contracted umbilicus, as well as the following char- 

 acteristics noticed by Bland. 



The groove within the umbilicus is a very marked feature in 

 Ferussac's species, and though not referred to in the description, is 

 distinctly shown in one of his figures ; it is entirely wanting in H. 

 leporina, and also in pustuloides. This groove is not only an ex- 

 ternal character, but its presence modifies the internal structure of 

 the shell. On opening the base of the last whorl immediately be- 

 hind the aperture, a strongly developed transverse tubercle is seen 

 within, from which a strong ridge-like lamella runs round the umbil- 

 ical opening, corresponding in extent with the groove. This tuber- 

 cle, and the extension of it, are entirely disconnected by a sinus or 

 channel from the floor of the penult whorl. 



The hirsute character of this species is not alluded to by any 

 author. The outer edge of the peristome in specimens from St. 

 Augustine, is of a deep rose color. 



The true pustula has been found at various localities in 

 Georgia, at St. Augustine, Fla. (Dorman), and in Texas, 

 (Moore, Roemer.) 



HELIX LABYRINTHICA SAY vol. ii. p. 202, pi. xvii. fig. 3. 



Helix labyrinthica SAY, (Binney's ed.) p. 10. 



CHEMNITZ, 1. c. i. 382, (1846). 

 PFEIFFEK, 1. c. iii. 262. 

 REEVE, Con. Icon. No. 728, (1852). 

 DEKAY, N. Y. Moll. 39, pi. iii. fig. 31. 

 DESHAYES, in Fer. i. 210. 



I have specimens of H. labyrinthica from the Northwest, 

 Canada, Florida, and Texas. Its range is probably not 

 surpassed by that of any other species. 



Lea is erroneously given as authority for the specific 

 name in Adams's Genera of Recent Mollusca. 



HELIX LIGERA SAY vol. ii. p. 204, pi. xxxv. 



Helix liyera SAY, (Binney's ed.) p. 19. 



DEKAY, N. Y. Moll. p. 40, excl. fig. 



